I am having the hardest time booking a vacation for our family. The most affordable trip I can find, for a family of 5, is through Costco. I am trying to decide between Royal Lahaina and Ka'anapali Beach Hotel. This is the first non camping vacation that my family has ever had and I am very concerned about beach erosion. I hate to spend the $7,000 and have ruined beaches. Also I am a little worried about crowding. Which one of these resorts has the least crowded beaches? Or am I better off staying on the south side? Our kids are 15, 12 and 4. The pressure of planning this vacation are killing me lol. Please help!